Fix historic Ghanaian Cedi ISO code
Fix historic Ghanaian Cedi ISO code

The configured historic Ghanaian Cedi ISO code was the same as the
current Ghanaian Cedi ISO code, GHS. However, the currency with numeric
ISO code 288 should have the ISO code GHC, as per:
https://www.currency-iso.org/dam/downloads/lists/list_three.xml

Shopify/money